<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <title>定制化按钮</title>
<!--    <link rel="stylesheet" href="style.css"/>-->
    <style>

        /* 清除浏览器默认边距，
        使边框和内边距的值包含在元素的height和width内 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        /* flex布局，让内容垂直和水平居中 */
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: #000;
        }
        /* flex布局，让内容垂直和水平居中，超过的部分换行显示 */
        .container {
            display: flex;
            justify-content: center;
            align-items: center;
            flex-wrap: wrap;
        }
        /* 按钮的基本样式 */
        .container a {
            position: relative;
            padding: 15px 30px;
            margin: 50px;
            border: 2px solid #0f0;
            font-size: 18px;
            font-weight: 600;
            text-decoration: none;
            letter-spacing: 5px;
            color: #fff;
            filter: hue-rotate(calc(var(--x) * 60deg));
            transition: 0.5s;
        }
        /* 鼠标经过时改变按钮样式 */
        .container a:hover {
            transition-delay: 1.5s;
            color: #000;
            box-shadow: 0 0 10px #0f0,
            0 0 20px #0f0,
            0 0 40px #0f0,
            0 0 80px #0f0,
            0 0 160px #0f0,
            0 0 320px #0f0;
        }
        a span {
            position: relative;
            z-index: 10;
        }
        /* 通过伪元素::before实现按钮左边的线 */
        .container a::before {
            content: "";
            position: absolute;
            left: -20px;
            top: 50%;
            transform: translateY(-50%);
            background: #0f0;
            width: 20px;
            height: 2px;
            box-shadow: 5px -8px 0 #0f0,
            5px 8px 0 #0f0;
            transition: width 0.5s, height 0.5s, left 0.5s,
            box-shadow 0.5s;
            transition-delay: 0s, 1s, 0s, 0.5s;
        }
        /* 鼠标经过时改变线条的样式 */
        .container a:hover::before {
            width: 60%;
            height: 100%;
            left: -2px;
            box-shadow: 0 0 0 #0f0,
            0 0 0 #0f0;
        }
        /* 通过伪元素::after实现按钮右边的线 */
        .container a::after {
            content: "";
            position: absolute;
            right: -20px;
            top: 50%;
            transform: translateY(-50%);
            background: #0f0;
            width: 20px;
            height: 2px;
            box-shadow: -5px -8px 0 #0f0,
            -5px 8px 0 #0f0;
            transition: width 0.5s, height 0.5s, right 0.5s,
            box-shadow 0.5s;
            transition-delay: 0s, 1s, 0s, 0.5s;
        }
        /* 鼠标经过时改变线条的样式 */
        .container a:hover::after {
            width: 60%;
            height: 100%;
            right: -2px;
            box-shadow: 0 0 0 #0f0,
            0 0 0 #0f0;
        }

    </style>
</head>
<body>
<!-- 容器 -->
<div class="container">
    <!-- 按钮 -->
    <a href="#" style="--x:0"><span>${username}</span></a>
    <a href="#" style="--x:1"><span>收藏</span></a>
    <a href="#" style="--x:2"><span>投币</span></a>
    <a href="#" style="--x:3"><span>点赞</span></a>
    <a href="#" style="--x:4"><span>评论</span></a>
    <a href="#" style="--x:5"><span>转发</span></a>
</div>
</body>
</html>
